- 110 -
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. Trouble shooting
GM310f service manual
5.18.3.1 Checking WCDMA Rx part(WCDMA 2100/900)
Checking Flow
NO
NO
-
Checking Flow
About -25.5 dBm?
YES
-
Set RX level = -25 dBm
Check TP1
Check SW1001
YES
Check TP2 or TP6
About -27 dBm?
Check FL1001(FEM)
NO
Check TP3 or TP7
About -29 dBm?
Check FL1004(B7646)
NO
FL1007(B7638)
or
YES
Change Rx level = -80 dBm
Check TP3 level
Check TP4 or TP8 level
>=(TP3 level+15 dBm)
YES
YES
Check TP5 or TP9 level
>=TP4 level-2 dBm?
Check U606
(BGA735)
Check FL1002 or FL1006
Check U1004 and U103
YES
NO
Rx Still has problem?
YES
NO
Rx Path is OK
YES
TP3
TP2
TP7
TP8
TP6
TP9
TP1
TP5
TP4
Checking Point
Comments!!
WCDMA2100 Trouble : TP1~TP5
WCDMA900 Trouble : TP1, TP6~TP9